IS there a way we can append row wise, so that it all stacks up horizontally, the way you do it in xlswrite in matlab, where you can even specify the cell number from where you want to write.
-Ashish From: R. Michael Weylandt [mailto:michael.weyla...@gmail.com] Sent: Thursday, September 22, 2011 12:03 AM To: Jan van der Laan Cc: r-help@r-project.org; ashish.ku...@esteeadvisors.com Subject: Re: [R] R help on write.csv Oh darn, I had that line and then when I copied it to gmail I thought I'd be all slick and clean up my code: oh well...just not my day/thread... It's possible to work around the repeated headers business (change to something like "Call$col.names <- !append") but yeah, at this point I'm thinking its perhaps better practice to direct the OP to the various connection methods: sink() is nice, but he'll probably have to do something to convert his object to a CSV like string before printing: apply(OBJ, 1, paste, sep=",") Michael Weylandt On Wed, Sep 21, 2011 at 11:20 AM, Jan van der Laan <e...@dds.nl> wrote: Michael, You example doesn't seem to work. Append isn't passed on to the write.table call. You will need to add a Call$append<- append to the function. And even then there will be a problem with the headers that are repeated when appending. An easier solution is to use write.table directly (I am using Dutch/European csv format): data <- data.frame(a=1:10, b=1, c=letters[1:10]) write.table(data, file="test.csv", sep=";", dec=",", row.names=FALSE, col.names=TRUE) write.table(data, file="test.csv", sep=";", dec=",", row.names=FALSE, col.names=FALSE, append=TRUE) When first openening a file connection and passing that to write.csv or write.table data is also appended. The problem with write.csv is that writing the column names can not be suppressed which will result in repeated column names: con <- file("d:test2.csv", "wt") write.csv2(data, file=con, row.names=FALSE) write.csv2(data, file=con, row.names=FALSE) close(con) So one will still have to use write.table to avoid this: con <- file("d:test2.csv", "wt") write.table(data, file=con, sep=";", dec=",", row.names=FALSE, col.names=TRUE) write.table(data, file=con, sep=";", dec=",", row.names=FALSE, col.names=FALSE, append=TRUE) close(con) Using a file connection is probably also more efficient when doing a large number of appends. Jan Quoting "R. Michael Weylandt" <michael.weyla...@gmail.com>: Touche -- perhaps we could make one though? write.csv.append <- function(..., append = TRUE) { Call <- match.call(expand.dots = TRUE) for (argname in c("col.names", "sep", "dec", "qmethod")) if (!is.null(Call[[argname]])) warning(gettextf("attempt to set '%s' ignored", argname), domain = NA) rn <- eval.parent(Call$row.names) Call$col.names <- if (is.logical(rn) && !rn) TRUE else NA Call$sep <- "," Call$dec <- "." Call$qmethod <- "double" Call[[1L]] <- as.name("write.table") eval.parent(Call) } write.csv.append(1:5,"test.csv", append = FALSE) write.csv.append(1:15, "test.csv") Output seems a little sloppy, but might work for the OP. Michael Weylandt On Wed, Sep 21, 2011 at 9:03 AM, Ivan Calandra <ivan.calan...@uni-hamburg.de wrote: I don't think there is an append argument to write.csv() (well, actually there is one, but set to FALSE). There is however one to write.table() Ivan Le 9/21/2011 14:54, R. Michael Weylandt <michael.weyla...@gmail.com> a écrit : The append argument of write.csv()? Michael On Sep 21, 2011, at 8:01 AM, "Ashish Kumar"<ashish.kumar@** esteeadvisors.com <ashish.ku...@esteeadvisors.com>> wrote: Hi, I wanted to write the data created using R on existing csv file. However everytime I use write.csv, it overwrites the values already there in the existing csv file. Any workaround on this. Thanks for your help Ashish Kumar Estee Advisors Pvt. Ltd. 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